How do I choose the right digital multimeter?

A digital multimeter measures voltage, current, resistance and continuity, and often capacitance, frequency and temperature. The key selection factors are True-RMS, resolution in counts, accuracy, the CAT safety rating and input protection. This guide walks you through the criteria that matter most.

4 minStand: 2026-07Geprüft: Measurement specialists

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True-RMS

Accurate reading of non-sinusoidal signals

6,000+

Counts for fine resolution

CAT II-IV

Safety rating by location

600 V

Typical handheld range

Inhalt

Basics
Selection criteria
Form factor and use
Frequently asked questions

What does a digital multimeter measure?

A digital multimeter (DMM) combines several measurement functions in one instrument. The standard set covers DC and AC voltage, current, resistance and continuity with an audible signal. Many models also measure capacitance, frequency, diodes and temperature, so a single device handles most tasks in electronics and maintenance.

Voltage (DC/AC): mains, battery and signal voltages
Current (DC/AC): current draw and load testing
Resistance and continuity: wiring, contacts, fuses
Capacitance, frequency, temperature: extended diagnostics

For current measurement in the ampere range, many meters use a separate input with its own fuse. Check the maximum measurement current before connecting a load.

Which criteria decide the choice?

The deciding factors are True-RMS for distorted AC signals, resolution in counts, accuracy in percent, the CAT safety rating and input protection. Auto-ranging saves time, and robust overload protection increases safety. The table below summarises what to look for with each criterion.

The CAT rating must match the environment: CAT II for final circuits and outlets, CAT III for fixed installations and distribution, CAT IV for the utility supply. When in doubt, choose the higher rating.

Handheld or bench - which suits your work?

Handheld multimeters are portable, rugged and ideal for service, maintenance and field work. Bench multimeters offer higher resolution, more digits and stable references for the lab, calibration and test benches. Your choice depends on mobility, the accuracy required and the nature of the measurement task.

Handheld multimeter

Compact, battery powered and shock resistant for mobile use on site.

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Bench multimeter

High resolution and stability for the lab, calibration and automated testing.

View bench units

For continuous recording of readings over long periods, a data logger is the better complement to a multimeter.

Frequently asked questions

What does True-RMS mean on a multimeter?

True-RMS stands for true root mean square measurement. Such meters read distorted or non-sinusoidal AC signals correctly, as found on variable frequency drives or switching power supplies. Averaging meters show incorrect values in those cases.

Which CAT rating do I need?

The CAT rating depends on the location: CAT II for outlets and end devices, CAT III for fixed installations and distribution, CAT IV for the utility supply and meters. When in doubt, choose the higher rating with a suitable working voltage.

How many counts should a multimeter have?

For general electronics and maintenance, 6,000 counts is a good benchmark. Higher values give finer resolution and more displayed digits. For precise lab tasks, bench instruments with much higher resolution are appropriate.

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Our measurement specialists help you select the right digital multimeter for your application and the correct CAT rating.

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Curated selection

Digital multimeters from established makers for electronics and maintenance.

Safety focus

Instruments with the right CAT rating and reliable input protection.

Expert advice

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